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Swelling of the brain, spinal cord, or the surrounding tissues (encephalitis or meningitis)

Guillain-Barré syndrome, an uncommon sickness of the nervous system in which a person’s own immune system damages the nerve cells, causing muscle weakness, and sometimes, paralysis.

Internal organ dysfunction or failure

If you recently received the yellow fever vaccination and develop fever, headache, tiredness, body aches, vomiting, or diarrhea, see your healthcare provider.

Some people may have an increased risk of developing a reaction to the vaccine, but may still benefit from being vaccinated. These people, or their guardians, should talk to a healthcare provider about getting vaccinated: